@zjuhasz I'm interesting in wrapping any and all backends that people are interested in / someone has time to wrap. nd4j is on my radar, so is ojalgo as it was recommended by @thomasnield. I'm also planning to have at least two js backends, one that is optimized for node and one that can run in the browser. on native, cblas might be enough, but we could add support for armadillo/eigen/etc if there's someone with a use case for it.